Derivative Instruments and Hedge Activities - Additional Information (Details) - USD ($)	1 Months Ended	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019	Dec. 31, 2019
Derivative [Line Items]
Derivative notional amount		$ 382,435,000		$ 382,435,000		$ 341,358,000
Unrealized gain (loss) to be reclassified as an decrease to interest expense during the next twelve months		(92,000)		(92,000)
Fair value of derivatives net liability position		20,300,000		20,300,000
Collateral amount posted		20,900,000		20,900,000
Settlement obligation termination value		20,300,000		20,300,000
Other Interest Rate Derivatives
Derivative [Line Items]
Derivative notional amount		373,782,000		$ 373,782,000
Derivative maturity date, start year				2022-01
Derivative maturity date, end year				2030-03
Derivative instruments transaction fees		41,000	$ 170,000	$ 700,000	$ 886,000
Other Credit Derivatives
Derivative [Line Items]
Derivative notional amount		8,700,000		8,700,000		9,300,000
Derivatives Designated as Hedging Instruments | Interest Rate Swaps | Cash Flow Hedging
Derivative [Line Items]
Derivative notional amount		0		0		$ 0
Termination of designated as cash flow hedges to reduce interest risk	$ 250,000,000.0
Transaction, net of tax	$ 383,000
Remaining balance in accumulated other comprehensive loss		$ (320,000)		$ (320,000)